The utility model relates to a transformer low-voltage side connection clip for safety protection and mounted on a low-voltage side of a transformer, during the maintenance and repair process of the transformer in a 220KV substation of the power industry. The connection clip is characterized in that: one grounding end fixation clip is connected with three grounding line connection clips by conduction wires, thus the connection clip is safely, conveniently, and firmly connected with the conduction wire on the low-voltage side of the transformer, the residual voltage of the cable is completely discharged, a conductive rod ceramic bottle on the outlet of the low-voltage side of the transformer is not damaged, the safety of devices and personnel is ensured during the maintenance and repair of the transformer in the substation.